短語詞組短語Railroad trunk -line 干線鐵路vertical trunk reference line 垂直參考線trunk pipe line 管道斡線trunk junction line 長(zhǎng)市局間中繼線trunk -line airplane 干線飛機(jī)trunk railway line 鐵路干線trunk subscribers line 長(zhǎng)途專線用戶線 返回 trunk line